From 7bea96fd22a8fd19f90817405b4abe032317a0e3 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@ftp.linux.org.uk>
Date: Sun, 8 Oct 2006 22:49:34 +0100
Subject: [PATCH] uml pt_regs fixes

Real fix for UML pt_regs stuff.  Note set_irq_regs() logics in there...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index cfd9f01..426633e 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -20,7 +20,7 @@
 
 #define LINE_BUFSIZE 4096
 
-static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused)
+static irqreturn_t line_interrupt(int irq, void *data)
 {
 	struct chan *chan = data;
 	struct line *line = chan->line;
@@ -364,8 +364,7 @@ void line_unthrottle(struct tty_struct *tty)
 		reactivate_chan(&line->chan_list, line->driver->read_irq);
 }
 
-static irqreturn_t line_write_interrupt(int irq, void *data,
-					struct pt_regs *unused)
+static irqreturn_t line_write_interrupt(int irq, void *data)
 {
 	struct chan *chan = data;
 	struct line *line = chan->line;
@@ -712,7 +711,7 @@ struct winch {
 	struct tty_struct *tty;
 };
 
-static irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
+static irqreturn_t winch_interrupt(int irq, void *data)
 {
 	struct winch *winch = data;
 	struct tty_struct *tty;
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index a67dcbd..d08bd03 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -74,8 +74,7 @@ static void mc_work_proc(void *unused)
 
 static DECLARE_WORK(mconsole_work, mc_work_proc, NULL);
 
-static irqreturn_t mconsole_interrupt(int irq, void *dev_id,
-				      struct pt_regs *regs)
+static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
 {
 	/* long to avoid size mismatch warnings from gcc */
 	long fd;
@@ -674,8 +673,9 @@ static void with_console(struct mc_request *req, void (*proc)(void *),
 static void sysrq_proc(void *arg)
 {
 	char *op = arg;
-
-	handle_sysrq(*op, &current->thread.regs, NULL);
+	struct pt_regs *old_regs = set_irq_regs(&current->thread.regs);
+	handle_sysrq(*op, NULL);
+	set_irq_regs(old_regs);
 }
 
 void mconsole_sysrq(struct mc_request *req)
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index c1c5604..ec9eb8b 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -77,7 +77,7 @@ static void uml_dev_close(void* dev)
 	dev_close( (struct net_device *) dev);
 }
 
-irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t uml_net_interrupt(int irq, void *dev_id)
 {
 	struct net_device *dev = dev_id;
 	struct uml_net_private *lp = dev->priv;
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
index 73755f3..ce9f373 100644
--- a/arch/um/drivers/port_kern.c
+++ b/arch/um/drivers/port_kern.c
@@ -47,7 +47,7 @@ struct connection {
 	struct port_list *port;
 };
 
-static irqreturn_t pipe_interrupt(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t pipe_interrupt(int irq, void *data)
 {
 	struct connection *conn = data;
 	int fd;
@@ -152,7 +152,7 @@ void port_work_proc(void *unused)
 
 DECLARE_WORK(port_work, port_work_proc, NULL);
 
-static irqreturn_t port_interrupt(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t port_interrupt(int irq, void *data)
 {
 	struct port_list *port = data;
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index f0b0668..bc458f5 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -524,7 +524,7 @@ static void ubd_handler(void)
 	do_ubd_request(ubd_queue);
 }
 
-static irqreturn_t ubd_intr(int irq, void *dev, struct pt_regs *unused)
+static irqreturn_t ubd_intr(int irq, void *dev)
 {
 	ubd_handler();
 	return(IRQ_HANDLED);
diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
index 6036ec8..a4ce705 100644
--- a/arch/um/drivers/xterm_kern.c
+++ b/arch/um/drivers/xterm_kern.c
@@ -21,7 +21,7 @@ struct xterm_wait {
 	int new_fd;
 };
 
-static irqreturn_t xterm_interrupt(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t xterm_interrupt(int irq, void *data)
 {
 	struct xterm_wait *xterm = data;
 	int fd;
diff --git a/arch/um/include/irq_kern.h b/arch/um/include/irq_kern.h
index c222d56..81beb18 100644
--- a/arch/um/include/irq_kern.h
+++ b/arch/um/include/irq_kern.h
@@ -10,12 +10,11 @@
 #include "asm/ptrace.h"
 
 extern int um_request_irq(unsigned int irq, int fd, int type,
-			  irqreturn_t (*handler)(int, void *,
-						 struct pt_regs *),
+			  irqreturn_t (*handler)(int, void *),
 			  unsigned long irqflags,  const char * devname,
 			  void *dev_id);
 extern int init_aio_irq(int irq, char *name,
-			irqreturn_t (*handler)(int, void *, struct pt_regs *));
+			irqreturn_t (*handler)(int, void *));
 
 #endif
 
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 7c41dab..3c01c2b 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -355,14 +355,16 @@ void forward_interrupts(int pid)
  */
 unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
 {
-       irq_enter();
-       __do_IRQ(irq);
-       irq_exit();
-       return 1;
+	struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
+	irq_enter();
+	__do_IRQ(irq);
+	irq_exit();
+	set_irq_regs(old_regs);
+	return 1;
 }
 
 int um_request_irq(unsigned int irq, int fd, int type,
-		   irqreturn_t (*handler)(int, void *, struct pt_regs *),
+		   irqreturn_t (*handler)(int, void *),
 		   unsigned long irqflags, const char * devname,
 		   void *dev_id)
 {
@@ -423,8 +425,7 @@ void __init init_IRQ(void)
 	}
 }
 
-int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *,
-							     struct pt_regs *))
+int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *))
 {
 	int fds[2], err;
 
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
index 0ad755c..2b0ab43 100644
--- a/arch/um/kernel/sigio.c
+++ b/arch/um/kernel/sigio.c
@@ -17,7 +17,7 @@
 /* Protected by sigio_lock() called from write_sigio_workaround */
 static int sigio_irq_fd = -1;
 
-static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused)
+static irqreturn_t sigio_interrupt(int irq, void *data)
 {
 	char c;
 
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index a92965f..2e354b3 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -86,7 +86,7 @@ static inline unsigned long long get_time(void)
 	return nsecs;
 }
 
-irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
+irqreturn_t um_timer(int irq, void *dev)
 {
 	unsigned long long nsecs;
 	unsigned long flags;
-- 
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